Friday's solar storm was the second major space weather event in three days, but was not aimed at Earth. According to astronomer Phil Plait, who chronicled the flare on his Bad Astronomy blog, the solar storm launched super-hot solar plasma about 120,000 miles (200,000 kilometers) above the surface of the sun before it faded from view.

The sun fired off a May Day solar eruption on Wednesday (May 1) from the same region, which is currently at the very leftmost edge (or limb) of the sun as seen by the Solar Dynamics Observatory. The active region will be rotating to face Earth soon, mission scientists said.

"Increased number of flares are quite common at the moment, as the sun's normal 11-year activity cycle is ramping up toward solar maximum, which is expected in late 2013," NASA officials said in a statement.

The strongest solar flare of the year occurred on April 11 and registered as an M6.5-class sun storm, still a mid-level event. Scientists classify solar flares based on their intensity. M-class solar flares are medium-strength events that are the weakest type of storm that can still have an impact on Earth. When aimed directly at Earth, they can super-charge the planet's aurora displays.

NASA's Solar Dynamics Observatory captured this image of an M5.7-class flare on May 3, 2013, at 1:30 …

The strongest type of solar flare are X-class sun storms. When aimed directly at Earth, X-class solar flares can pose a threat to spacecraft and astronauts in space. They can also interfere with communications and GPS navigation signals, and cause radio blackouts.

A radio short-lived radio blackout was caused by the Friday solar flare, but subsided quickly, NASA officials said.

The sun's current solar weather cycle is known as Solar Cycle 24. The Solar Dynamics Observatory is one of several spacecraft constantly monitoring the sun to track its solar weather events.